I'm working on an EF Code first site, and I've written my classes and a context class, the source of which is:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.Entity;
using MySite.SalesTool.Data.Entities;
using System.Data.Entity.ModelConfiguration.Conventions;
namespace MySite.SalesTool.Data
{
public class SalesToolEntities : DbContext
{
public DbSet<User> Users { get; set; }
public DbSet<UserRole> UserRoles { get; set; }
public DbSet<Job> Jobs { get; set; }
public DbSet<JobAssigner> JobAssigners { get; set; }
public DbSet<JobFile> JobFiles { get; set; }
public DbSet<JobStatus> JobStatuses { get; set; }
public DbSet<AssignedUser> AssignedUsers { get; set; }
}
}
The project builds fine, but when I go to run the site, no tables are created in the database and I get an error stating that the database can't find whichever context object I try and access, presumably because the code first has not generated any of the necessary tables.
Any ideas why it wouldn't generate any of the tables at all, and not give me any kind of error information?
Do you have an initialization strategy?
Database.SetInitializer(new DropCreateDatabaseIfModelChanges<SalesToolEntities>());
From what you subscribe it sounds like you've created the database yourself. Then you need to specify an initialization
strategy otherwise no tables/data will be added to the database and querying the database will result in an exception: {"The specified table does not exist. [ sometable ]"}
Related
This is my first time with MVC so please excuse me if I am getting the terminology wrong. I am working on a PluralSight course.
My understanding is scaffolding goes to the model and creates a view when selecting Add View.
Here's my model
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace OdeToFood.Models
{
public class RestaurantReview
{
public int Id { get; set; }
public int Rating { get; set; }
public string Body { get; set; }
public string ReviewerName { get; internal set; }
public int RestaurantId { get; set; }
}
}
I go to my controller action and click Add View. My view is missing ReviewerName when it is built. I add ReviewerName manually to my Create view. The ReviewerName appears to not be recognized by the Model Binder when data is added to the database.
I am unsure where to go from here. Thanks for you help!
When you mark the property setter as internal, the scaffolding ignores it. Simply remove that from the property and you should be set (pun intended):
public string ReviewerName { get; set; }
I want to implement a change log as advised in
Dev Express XAF T474899
I am using the security system generated by the XAF new solution wizard
I have defined some business objects to store the change log information.
One of these objects stores a link to the user
public virtual User User { get; set; }
On generating the code migration I am surprised to see the Up() method add the following
RenameTable(name: "dbo.UserRoles", newName: "RoleUsers");
DropPrimaryKey("dbo.RoleUsers");
AddPrimaryKey("dbo.RoleUsers", new[] { "Role_ID", "User_ID" });
On another occasion I found the following in an Up()
RenameTable(name: "dbo.EventResources", newName: "ResourceEvents");
// lots of other stuff
DropPrimaryKey("dbo.ResourceEvents");
AddPrimaryKey("dbo.ResourceEvents", new[] { "Resource_Key", "Event_ID" });
On both occasions the code that creates the entities is a Dev Express libary.
I have cross posted this question to Dev Express Support
The Dev Express business objects are defined in DevExpress.Persistent.BaseImpl.EF;
My DbContext context refers to them as
public DbSet<Role> Roles { get; set; }
public DbSet<User> Users { get; set; }
The meta data for Role shows
The meta data for User shows
My own business classes contain
namespace SBD.JobTalk.Module.BusinessObjects
{
[NavigationItem("Configuration")]
[DisplayName("Staff")]
[DefaultProperty("Summary")]
[ImageName("BO_Employee")]
[Table("Staff")]
public class Staff : BasicBo
{
public Staff()
{
Person = new Person();
}
public virtual Person Person { get; set; }
[StringLength(100, ErrorMessage = "The field cannot exceed 100 characters. ")]
[scds.Index("IX_Staff_UserName", 1, IsUnique = true)]
public string UserName { get; set; }
[NotMapped]
public string Summary => $"{Person.FirstName} {Person.LastName}";
//public virtual User User { get; set; }
}
}
public abstract class BasicBo : IXafEntityObject
{
[Browsable(false)]
[Key]
public virtual int Id { get; set; }
public virtual void OnCreated()
{
}
public virtual void OnSaving()
{
}
public virtual void OnLoaded()
{
}
}
If I un-comment the code to have the User property inside Staff, and generate a migration, the migration Up is
public override void Up()
{
RenameTable(name: "dbo.UserRoles", newName: "RoleUsers");
DropPrimaryKey("dbo.RoleUsers");
AddColumn("dbo.Staff", "User_ID", c => c.Int());
AddPrimaryKey("dbo.RoleUsers", new[] { "Role_ID", "User_ID" });
CreateIndex("dbo.Staff", "User_ID");
AddForeignKey("dbo.Staff", "User_ID", "dbo.Users", "ID");
}
[Update]
Interestingly there are more Dev Express tables than I first thought.
The primary keys are Identity.
I think am using Standard Authentication created before Dev Express added the Allow/Deny ability (V16.1)
[Update]
When I create a new project with the above settings, here is the DbContext.
using System;
using System.Data;
using System.Linq;
using System.Data.Entity;
using System.Data.Common;
using System.Data.Entity.Core.Objects;
using System.Data.Entity.Infrastructure;
using System.ComponentModel;
using DevExpress.ExpressApp.EF.Updating;
using DevExpress.Persistent.BaseImpl.EF;
using DevExpress.Persistent.BaseImpl.EF.PermissionPolicy;
namespace XafApplication1.Module.BusinessObjects {
public class XafApplication1DbContext : DbContext {
public XafApplication1DbContext(String connectionString)
: base(connectionString) {
}
public XafApplication1DbContext(DbConnection connection)
: base(connection, false) {
}
public XafApplication1DbContext()
: base("name=ConnectionString") {
}
public DbSet<ModuleInfo> ModulesInfo { get; set; }
public DbSet<PermissionPolicyRole> Roles { get; set; }
public DbSet<PermissionPolicyTypePermissionObject> TypePermissionObjects { get; set; }
public DbSet<PermissionPolicyUser> Users { get; set; }
public DbSet<ModelDifference> ModelDifferences { get; set; }
public DbSet<ModelDifferenceAspect> ModelDifferenceAspects { get; set; }
}
}
OK, I will take a stab :) Your Up() code is trying to rename the table UserRoles to RoleUsers. This means you have a prior migration where UserRoles was the table name - probably from your DevEx stuff. This could happen if they changed their models in an upgrade. The current models are expecting RoleUsers etc. so you need to get there.
So first option is let the migration do the renaming to match the underlying model. I assume this didn't work or causes other issues?
You might be able to 'fool' entity framework into using the old tables with fluent code or annotations, but if it has new columns or relationships that won't work.
What I would do is this:
1) Create a new test project with the same references you had and
copy your context and DbSets. Point the connection string to a
new database.
2) Add a migration and script it out:
update-database -Script.
3) Examine this script a use it to create
the objects needed in your database. Migrate data from the old
tables to new if needed.
4) Remove the old tables
5) In your actual
project add a migration to resync your models:
add-migration SyncDevExUpdate -IgnoreChange, update-database
Now you will have the tables your models expect.
I have an model I reference in a DbContext class I'm using to generate my code-first DB. Originally the model was named FeedEventDomainModel and I changed the name to FeedEventCommand.I haven't generated the DB yet; however when I run the application to open Index.html under the areas folder, I receive the following error:
Code:
DbContext Class
using System.Data.Entity;
namespace OProj.DataContext
{
public class OProjDBContext : DbContext
{
public OProjDBContext() : base("name=OProjDB")
{
}
public DbSet<FeedEventCommand> FeedEvents { get; set; }
}
}
FeedEventCommand
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
namespace OProj.DataContext
{
public class FeedEventCommand
{
[Key]
public int Id { get; set; }
public int AnimalId { get; set; }
public int FeederTypeId { get; set; }
public string FeederType { get; set; }
}
}
My question is since I changed the name of my model from FeedEventDomainModel to FeedEventCommand, is there a place in cache I need to clear so it doesn't keep referencing the old model name?
do a full clean.
close Visual Studio
delete the temp files in Windows/Microsoft.Net/Framework and Framework64/v4.0/Temporary ASP.NET Files
reopen the solution in VS, rebuild and it should work.
renaming things has that kind of effect so you have to delete the cached files
I am practicing Entity Framework. I am practicing Asp.net MVC framework using Razor Engine and EF Code First. In practicing it, I found to have few problems. The problem is the Entity Framework doesnt creates a database in my SQL.
I am using VisualStudio 2011 Beta Version with MSSQL 2008. I dont know what the problem is.
Help required. Below is my Code :
Person.cs
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
namespace MvcDemo.Data
{
public class Person
{
[Key]
public int PersonID { get; set; }
[Required]
[StringLength(40)]
public string FirstName { get; set; }
[Required]
[StringLength(30)]
public int LastName { get; set; }
public int? Age { get; set; }
[ForeignKey("PrefixID")]
public Prefix Prefix { get; set; }
[Required]
public int PrefixID { get; set; }
}
}
Prefix.cs
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
namespace MvcDemo.Data
{
public class Prefix
{
public int PrefixID { get; set; }
[Required]
[StringLength(20)]
public string PrefixName { get; set; }
}
}
MvcContext.cs
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using MvcDemo.Data;
namespace MvcDemo.DataAccess
{
public class MvcContext : DbContext
{
public MvcContext()
: base("name = MvcDemoApp")
{
}
public DbSet<Person> People { get; set; }
public DbSet<MvcDemo.Data.Prefix> Prefix { get; set; }
}
}
ConnectionString:
<connectionStrings>
<add name="MvcDemoApp"
connectionString="Server=.;Initial Catalog=MvcDemoApp;Integrated Security=true"
providerName="System.Data.SqlClient" />
If this is all of your code it is not surprising that a database is not created. There is no code that executes commands against the database. As soon as you start iterating over e.g. MvcContext.People or do some insert you will notice that the database gets created.
There are plenty step-by-step examples online. I would pick one of them and do a walk through; you can try this one for example: http://msdn.microsoft.com/en-us/data/gg685467.aspx. It should cover most of the basics to get you started.
If you prefer video over text, search Channel 9, or pluralsight
You should operate package manager console to do it.
Ope package manager console window and run "update-database" command, there still a bug in this command so you need to specify "startupprojectname" param to execute it and connection string in you DbContext file.
I'm using code-first in Web Forms (not MVC) with EF4 and CTP5, and when trying to decorate a property with the [Key] attribute, it doesn't show up in the intellisense and get compilation error saying KeyAttribute was not found. Here is my code:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.ComponentModel.DataAnnotations;
namespace ERP.Models
{
public class CustomerAddress
{
[Key]
public int AddressID { get; set; }
public int CustomerID { get; set; }
public string Address1 { get; set; }
public string Address2 { get; set; }
public int CityID { get; set; }
public int SateID { get; set; }
}
}
I have included the DataAnnotations library, all looks ok, but the [Key] attribute is not found. Any hint is highly appreciated. Thanks!
I didn't post it as answer first because I wasn't sure if the problem is not elsewhere. You must add System.ComponentModel.DataAnnotations.dll to project references.